Institute of Foundation Models: K2-Horizon-375B-A23B

Name: K2-Horizon-375B-A23B
Author: Institute of Foundation Models

K2-Horizon-375B-A23B is a reasoning model from Institute of Foundation Models. It reads text and writes text, with a 524K token context window.

Its weights are open, so you can host it yourself.

Modalities
In / out price: n/a
Context: 524K
Max output: n/a
Released: n/a
Knowledge cutoff: n/a

Tool calling
Structured output
Reasoning
Prompt caching
Open weights
Free to use

K2-Horizon-375B-A23B questions

What is the context window of K2-Horizon-375B-A23B?

524,288 tokens of input. As a rough guide, a million tokens is around 750,000 English words.

Does K2-Horizon-375B-A23B support tool calling?

Not through the standard tools parameter. For an agent that calls your APIs, pick a model from the alternatives below that does.

Is K2-Horizon-375B-A23B open source?

Its weights are published, so you can run it on your own hardware or a cloud of your choice. Read the license before commercial use.

Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. Independent scores from my hand checked rankings, sources linked above. The summary is written from these facts.

Building on K2-Horizon-375B-A23B?

I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.

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